Looper mechanism for sewing-machines.



D. S. SEYMOUR.

LOOPER MECHANISM FOR SEWING MACHINES. APPLICATION min m11. s. 1914.

1,21 3,424. Patented Jan. 23, 1917.`

2 SHEETS-SHEET l.

rn: Nouns rsu-ks ou.. Pnomunw.. usumamm n' D. S. SEYMOUR.

LOOPER MECHANISM FOR SEWING MACHINES.

APPLICATION FILED MAR. 9, i914.

1 213 4.24. Patented Jan. 23, 1917. 2 SHEETS-SHEET 2.

'27 Z 22 J3 i Q Ilz j zg @vi/tuono@ Vthe eccentric vfor UNITED srarnsrn'rnnfr cierren.

DUDLEY S. SEYMOUR, 0F OAK PARK, ILLINOIS, ASSIGNOR 'IO UNION SECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORI'ORATION OF ILLINOIS.

Loornn i/inciianisi/i ron SEWING-MACHINES.

` Specicationof Letters Patent. j

Patented Jan. 23', w17.

Application filled March 9, 1914. Serial No. 823,409. 'A

sewing machines, and more particularly to` moving they the mechanism lfor positively looper back and forth in one direction relative to the needle.

`VAn object of the'invention is to provide Ymeans for adjusting the throw of the looper without varying the timing thereof relative 'to the 'movements of the needle.

' A further object of tleinventionfis to provide means for adjusting the position of vibrating the looper and for holdingsaid eccentric in adjusted positions.

ventimi, Figure 1j isja part sectional view showing a looper, Va

the looper. Fig.

Yend view. Fig. 4

These and other vobjects willjin part be obvious and will in part be hereinafter more' fully disclosed.

In the drawings, "which :show by way of illustration only one embodiment of ,thempart plan view and looper-support, and the means for vibrating 2 is a'sectionalview on an enlarged scale showingthe looper vibrating mechanism. Fig. 3 isa transverse sectional view through the work support showing the looper vibrating mehanisin in side elevation. Fig. 4 is a transverse sectional view showing the operating shaft, the supporting collar'for the-eccentric and the adjusting means for shift-ing the eccentric. Fig. 5 is a perspective view of the supporting collar, the eccentric and the adjusting means.y Fig. 6 isa detail showing the cylindrical bed in j 7 s va' diagrammaticl view showing the path of movement of the looper ypoint in different adjusted positions.v

The invention consists, generally, in providing an eccentric which gives only one of the movements to the looper, which ec vcentric may be adjusted KVArelative to the shaft for lvarying the throw of the looper.

A supporting collar is kattached to they which projects laterally set screw 14.

opening 16 through tends. This elongated opening permits the versely of the shaftfor I have shown the invention as applied to a sewing machine having Y from the standard 2 carried by the supporting Vhase 3. EX- tending longitudinally through the cylindrical bed 1 is alooper support 1, seeFig. 2. This looper support vis mounted'in suitable bearings in thel cylindrical jhed and ythe looper 5, see Fig.`1,"is pivotallyv mounted-on a carrier attached i The looper is so positioned as to move into to said looper support f1.

as to turn therewith, and this a cylindrical bedv 1 and out'of a needleloop in a plane which extends longitudinally of the looperysupport L1. The looper is oscillated back and Vforth into and :out of the needle` loop by a link-G which is operated froml a cross shaft in the standard 2. f, 'Y

The looper support lis oscillated so' to Y* give a needle avoiding movement to the looper.

eccentric 7 with which operates kan'eccentric strap 8. Tlieeccentric-'strap 8 is pivoted, at

9 to van arm 10'whi`ch isclamped to .thelooper support 4.' This arm is preferably split, as at 10, and a. clamping-'bolt'll `serves tol'clamp said arm on to the looper support 4:. AThe eccentric; is actuated by 4a-shaft 12' which maybe rotatedjor which'may be oscilla-.ted from suitablemeans in thestandard2- The present type of machine-is provided with an upper rotary shaftwhich operates the cross shafts inthe standard and these cross shafts in turn operate'the looper andthe feeding mechanism' of the sewing machine.`

The shaft 121is provided with a collarl 1.3 which is rigidly attached tothe shaft by a The 'eccentric 7 is formed integral with a sleeve 15. Said sleeve and eccentric vare each'provi'ded with an .elongated which the shaft 12 eX- sleeve and the' eccentric Vto bemoved transv Vvarying the eccen-v tricity of he eccentric and thereby varying the eifective throw thereof.

The collar 13 has laterally projecting parts 17 and these parts are slotted, as at18. Said slots 18 are parallel withV each other and are elongated. Bolts 19k entend through these slot-s into the sleeve 15. `When said bolts are loosened, the sleeve can be ad- This is accomplished through anV justed transversely of the collar and by tightening said bolts, the parts may be rmly locked together. The sleeve l5 also carries a rib 2O which extends into a slot 2l formed in the collar 13. This rib and slot connection serves to iii'mly hold the sleeve and ycol'iar so that the eccentric will be rotated or oscillated with the shaft, partakiiig of the movements of the collar 13 which is fixed to the shaft. The upper end of the slotis bridged by a plate 22. A screw extends through said plate and av collar 2i cnt-he screw engages the under face of the plate while the head of the screw engages the uppei face of the plate. This permits the screw to turn and holds the saine from endwise movement.Y The screw is threaded into the rib Q0. j Then it is desired to adjust the throw of the looper, the bolts i9 are released and by turning the yscrew said collar 15 and the eccentric carried thereby will be moved positively transversely. of the shaft. The movement of the screwone way will increase the-throw Aof the eccentric as the center of the eccentric will thereby 4be moved farther frointhe center of the shaft,.while a moveinentof the screwin the opposite direction will decrease the throw of the eccentric.

lVlien the eccentric is adjusted the proper distance, the bolts 19 will be 'set up in order Vto holdthe parts firmly iii adjusted position. This adjustment of the eccentric varies the throw of the eccentric without varying the timing thereof. In other words, the maximum throw of the eccentric will always be in the same angular position, and, therefore, the lateral throw of the loopei' may be adjusted without varying the timing of the throw relative to the reciprocations. of the needle. Furthermore, the adjustment'of the throw of the looper is accomplished by positive means. Not only is the eccentric released so that it can be adj usted, but I have provided a screw for accomplishing this adjustment, so that I have means for making the adjustment as well as means for permitting the adjustment of the throw of the looper.

In Fig. 7 of the drawings, l have'shown diagrammatically the path of movement of the looper point in 'different adjusted posi tions. The curved line d-b-c-d indicates one path of movement of the looper, and the curved line awe-6 7' indicates the path of movement of the looper after its throw has been adjusted by shifting the eccentric away from the center of the operating shaft. It will be apparent from this diagrammatic view, that the lateral throw of the looper has been adjusted without in any way varying the timing ofthe looper in its movements into and out of the needle loop. This looper-operating mechanism with the adjusting means, is especially adapted for use .that the looper is given.

whereby the same may in a multiple needle machine. lVlien the needles are changed, and a needle of larger diameter used, then it is essential that the path of movement of the looper shall also be changed, so tliatthe looperpoint may move close to the needle asit enters the needle loop. lVhere a plurality of` needles are used, it is essential that the looper when entering the needle loops shallV be travel-v ing substantially in a straight line, sofas to pass close to each needle. l

It will be seen from the diagrammatic view of the path of Ymovement of the looper,

a. movement sulstantially in a right line as it is passing into each of the needle loops, rand when the lateral throw of the looper is varied upon the change of the needles, moves in tliedesired cooperative relation to the needles. Y

It is obvious that iniiioi' changes inthe Y details of construction and arrangemeiitof parts may be made, without departing from the looper still the spirit ofthe invention as set rforth'in the appended claims. Y

Having thus described my invention, what I claim as new tersPatent, is:-

and desire to secure by' Let-Y j l. A sewinginachine including in combie nation, a needle, a looper,y means for vibrat ing the looper linto andv out of the'needle loop, means formoving the looper laterally including a shaft, devices operated by the shaft, means for adjusting 2. A sewing machine including in'combisaid devices, and means foi-.holding said devicesV in adjustedl position.

nation, a needle, a looper,means for vibrating the looper into and out of the needle loop, means for moving the vlooper laterally including a supporting said eccentric on Vsaid shaft,

be adjusted'transversely of the shaft for adjusting` the lateral throw of the looper. l

8. A sewing machine includingin combination, a needle, a looper, means for vibrating the looper into and out of the needle loop, means for moving the looperlaterally including ashaft, an eccentric carried by,

said shaft, means for adjusting said eccentric transversely of the shaft, and means for holding the eccentric in adjusted position.

4. A sewing machine including in combination, a needle, a looper, ing the looper into and out of the needle loop, means for moving the looper laterally including a shaft, Ya collar mounted on said shaft, an eccentric supported and actuated by said collar, and means for shifting said eccentric on said collar shaft.

5. A sewing machine including in combination, a needle, a looper, means for vibratingtlie looper into and out of the needle' shaft, an eccentric, means forY means for vibrat-v transversely of said loop, means for moving the looper laterally including a shaft, a collar mounted on said shaft, an eccentric supported and actuated by said collar, means for shifting said eccentric on said collar transversely of said shaft, and means foi' holding said eccentric in adjusted position.

G. A sewing machine including in combination, a needle, a looper, means for vibrating the looper into and out of the needle loop, means for moving the looper laterally including a shaft, a collar fixed to said shaft, an eccentric attached to said collar and adjustable transversely of the shaft, a screw for VVadjusting said eccentric on said collar, and clamping bolts for holding said eccentric in adjusted position. j

T. A looper mechanism for sewing machines, comprising a looper support, a looper mounted thereon, means for oscillating said looper support including a shaft, a collar` mounted on'said shaft, an eccentric,'a sleeve attached to said eccentric and having a rib adapted to engage a slot in said collar, said sleeve and eccentric having an elongated opening therethrough, Wherebysaid sleeve and eccentric mty be adjusted transversely of the shaft on said collar, means for adjusting said sleeve transversely of the shaft and means for clamping said sleeve to sai Y 39j collar. Y Y, 8. A looper mechanism for sewing machines, comprising a looper support, a'looper p mounted thereon, meansforoscillating said looper support including a shaft, Va collar mounted on said shaft and having a slot eX- tending diagraminatically across the same, an eccentric, a sleeve carried on said eccen- Y tric and having a rib adapted to engage said slot, said collar having slots formed therein and at each side of said diametrical slot and y parallel thereto, clamping bolts located in said plate for preventing endwise movement'v of said screw, said Vadjusting 'screw being threaded into said sleeve. whereby said sleeve may be positively adjusted on the collar. r

In testimony ivliereof I affix in si nature, in thepresence of tivo witnesses. i

. DUDLEY S. SEYMOUR. lVitnesses l: j f

J, C. RATNER, A. F. BiiiiDsiiALn.'

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington. D. C." n 

